Micrel
TXRX_982_R1 Evaluation Board
12. In OEM Configuration Register 0 window,
set ENABLE/DISABLE to DISABLE, VMOD
REFERENCE to GND, and temperature
zone to INTERNAL.
Set-Up and Operation
Follow the step-by-step procedure to set-up the board
safely and properly:
1. Connect the on board DB-25 connector to the
parallel port of a computer.
13. In OEM Configuration Register 1 window:
a. Set APC OP-AMP TYPE to COMMON
EMITTER.
Note: Set the selection bit to 0, 0 should correspond
to EMITTER FOLLOWER, which should be displayed
on the bottom and COMMON EMITTER on the top.
2. Connect the differential input of the laser
driver to DATA output of the pattern generator.
3. Use a multimode fiber jumper, with
appropriate connectors to connect optical
output of the VCSEL to a VOA (variable
optical attenuator) preset to 0dB attenuation.
b. Select the voltage to report in
VINH:VINL.
4. Connect the output of the VOA to the optical
input of the DCA, power-meter, or optical to
electrical converter.
c. Set Feedback voltage source to 1.22V.
d. Set FEEDBACK BIAS REF and RES
TERMINATION to GND and VBIAS
DRIVE to SOURCE (NPN). Set
5. Pre-adjust the power supply to 3.3V and turn it
off. Connect TP3 to VCC (3.3V) and TP5 to
GND, then turn the power supply ON. The
total current drawn from the power supply
should be less than 300mA.
INTERNAL FEEDBACK RESISTOR to
an arbitrary value (1.6K for example).
e. Set FEEDBACK BIAS REF and RES
TERMINATION to GND and VBIAS
DRIVE to SOURCE (NPN).
6. Launch the MIC3000/1 software. The
MIC3001 Optical Transceiver Management
IC panel opens with Panels and Help grayed
out and only Utilities can be run.
f. Set INTERNAL FEEDBACK
RESISTOR to arbitrary value (1.6K for
example).
7. Refer to MIC3000/1 Software User’s Guide for
the detailed settings.
14. In OEM Configuration Register 2, the
MIC3001 address and look-up table offset can
be modified. The look-up table covers 128°C.
The temperature range for offset = 0 is 0° to
+127°C.) This range can be shifted down by
2x the value. The offset is set to. If offset = 15,
the temperature range becomes –30° to
+97°C.
8. On the main window select Utilities to open
the utilities panel, then select SCAN to read
the address of the MIC3001 and GET to read
the manufacturer ID, Device ID, and Die
Revision. If there is a failure in reading one of
these parameters, you cannot proceed further.
If all the parameters are read correctly, close
the Utilities window to return to the main
window where Panels and Help are no longer
grayed out.
15. In OEM Configuration Register 0 window,
set ENABLE/DISABLE to ENABLE.
16. On Panels list select OEM CONFIG 3-4 and
select EXTERNAL CALIBRATION (default
setting), LOS COMPARATOR ENABLE,
SHDN, RXLUT INPUT TEMPERATURE, and
RSOUT. If needed, later set ISTART to a
different value to speed up the APC loop
during laser turn ON after a FAULT
9. Select Panels to display the list of setting
panels.
10. All the bits displayed on the panels can be
read and/or modified on the panels or by
accessing the registers directly by selecting
ALL REGISTERS, enter the serial address,
the register address, select GET to read the
content or type a value and select SET NEW
to write. In this procedure the bits are set on
the panels.
occurrence. Close the window to return to
main window.
17. On Panels list, select External Calibration.
Set all the offsets to 0 and slopes to 1. Set
RX_PWR(1) to 1. These parameters might
need to be changed later to correct the
measured values (calibration). Return to the
main window.
11. Select OEM CONFIG 0-2 to open the OEM
configuration registers 0, 1, and 2 windows.
3
September 2004
M9999-092304
hbwhelp@micrel.com or (408) 955-1690
MICREL [ MICREL SEMICONDUCTOR ]
